Simplify handling of Transferable objects while (de)serializing.

third_party/WebKit/Source/bindings/core/v8/TransferableMessagePort.h

-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef TransferableMessagePort_h
-#define TransferableMessagePort_h
-
-#include "bindings/core/v8/Transferable.h"
-#include "core/CoreExport.h"
-#include "core/dom/MessagePort.h"
-
-namespace blink {
-
-class CORE_EXPORT TransferableMessagePort : public Transferable {
-public:
-    ~TransferableMessagePort() override { }
-    void append(MessagePort* messagePort)
-    {
-        m_messagePortArray.append(messagePort);
-    }
-    bool contains(MessagePort* messagePort)
-    {
-        return m_messagePortArray.contains(messagePort);
-    }
-    static TransferableMessagePort* ensure(TransferableArray& transferables)
-    {
-        if (transferables.size() <= TransferableMessagePortType) {
-            transferables.resize(TransferableMessagePortType + 1);
-            transferables[TransferableMessagePortType] = new TransferableMessagePort();
-        }
-        return static_cast<TransferableMessagePort*>(transferables[TransferableMessagePortType].get());
-    }
-    static TransferableMessagePort* get(const TransferableArray& transferables)
-    {
-        if (transferables.size() <= TransferableMessagePortType)
-            return nullptr;
-        return static_cast<TransferableMessagePort*>(transferables[TransferableMessagePortType].get());
-    }
-    HeapVector<Member<MessagePort>, 1>& getArray()
-    {
-        return m_messagePortArray;
-    }
-    DEFINE_INLINE_TRACE()
-    {
-        visitor->trace(m_messagePortArray);
-        Transferable::trace(visitor);
-    }
-private:
-    HeapVector<Member<MessagePort>, 1> m_messagePortArray;
-};
-
-} // namespace blink
-
-#endif // TransferableMessagePort_h